Method of processing received signals in a multi-input multi-output (MIMO) system

1. A method of transmitting feedback information from a receiving end, wherein the receiving end processes signals received via a corresponding antenna by applying a weight to each of the signals in a wireless communication system, the method comprising: estimating a channel matrix ‘H’ corresponding to at least one of the signals received from a transmitting end; determining two or more sub-matrices by extracting combinations of columns from the channel matrix ‘H’, such that each of the two or more sub-matrices comprise a smaller number of the columns than the channel matrix ‘H’; calculating at least one singular value set, wherein each of the at least one singular value set is calculated for a corresponding one of the two or more sub-matrices by applying a Singular Value Decomposition (SVD) scheme to each of the two or more sub-matrices; selecting a permutation matrix ‘P’ according to the at least one singular value set based on equations defined as: [ I 0 0 0 ] ⁢ P H ⁢ P H ⁢ HP ⁡ [ I 0 0 0 ] = [ u f H 0 0 0 ] ⁡ [ ∑ f 2 ⁢ 0 0 0 ] ⁡ [ u f 0 0 0 ] ⁢ ⁢ and ⁢ [ 0 0 0 I ] ⁢ P H ⁢ P H ⁢ HP ⁡ [ 0 0 0 I ] = [ 0 0 0 u s H ] ⁡ [ 0 0 0 ∑ s 2 ] ⁡ [ 0 0 0 u s ] , where the at least one singular value set comprises: ∑ f 2 ⁢ ⁢ = [ ∑ f ⁢ ⁢ 1 2 ⁢ 0 0 ∑ f ⁢ ⁢ 2 2 ] , ∑ s 2 ⁢ ⁢ = [ ∑ s ⁢ ⁢ 1 2 ⁢ 0 0 ∑ s ⁢ ⁢ 2 2 ] , ∑ f ⁢ ⁢ 1 2 ⁢ ⁢ , ∑ f ⁢ ⁢ 2 2 ⁢ ⁢ , ∑ s ⁢ ⁢ 1 2 ⁢ ⁢ , ⁢ and ⁢ ⁢ ∑ s ⁢ ⁢ 2 2 ; ⁢ and transmitting the selected permutation matrix ‘P’ as the feedback information to the transmitting end, wherein the selected permutation matrix ‘P’ comprises a largest singular value set.

2. The method of claim 1 , wherein the channel matrix ‘H’ is estimated using at least a Zero Forcing (ZF) scheme, a Minimum Mean Square Error (MMSE) scheme or an Interference Canceling (IC) scheme.